package com.ark.interceptor;

import com.ark.constant.JwtClaimsConstant;
import com.ark.context.BaseContext;
import com.ark.properties.JwtProperties;
import com.ark.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    private final JwtProperties jwtProperties;

    public JwtTokenUserInterceptor(JwtProperties jwtProperties) {
        this.jwtProperties = jwtProperties;
    }

    /**
     * 校验jwt
     * @param request 请求
     * @param response 相应
     * @param handler 处理
     * @return 校验结果
     * @throws Exception 异常
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //判断当前拦截到的是Controller的方法还是其他资源
        if(!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1.从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2.校验令牌
        try {
            log.info("jwt校验: {}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id: {}",userId);
            BaseContext.setCurrentId(userId);
            return true;
        }catch (Exception e) {
            //4.不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
